21 



PARAMECIUM 



i. Sketches of the animal: cuticle; ectoplasm; cilia; trichocysts ; endoplasm; oral groove; gullet; food 

 vacuoles; macronucleus. Draw the two contractile vacuoles in systole and diastole. 



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2. Feed with Indian ink : food, vacuoles. Watch the entrance of the food pellets into the endoplasm, the 

 rotation of the food vacuoles, and the extrusion of their undigested contents by the temporary anus. 



3. Stain with iodine: macronucleus; micronucleus ; trichocysts discharged. 



